This clearly says it was blocked by Content filtering. Did you try sending a blank mail? if that also not working then i would suggest you check your outgoing MX IP if it is listed in any RBL. Finally check the same with the Remote domain owner as well as they may also blacklist you.

>I'm having a similar issue. I have one user in particular who is getting these NDR's to certain domains.

>

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> You do not have permission to send to this recipient. For assistance, contact your system administrator. <mail@mydomain.com #5.7.1 smtp;554 5.7.1 Message cannot be accepted, rules rejection>

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>However, I was able to send the message to them from my email account on the same exchange server.

The SAME message, or a different one? Do you use, for example, the

same signature? Most likely it's the message contents that are being

rejected. Contact the admin at that site and find out why.

---

Rich Matheisen

MCSE+I, Exchange MVP

--- Rich Matheisen MCSE+I, Exchange MVP

Monday, October 18, 2010 8:52 PM

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